POST UTME BABCOCK UNIVERSITY 2019 Chemistry | Objective

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Question 1
The solubility product cons\tant (Ksp) of AgCl is 1.8 × 10^\( -10 \). Calculate the molar solubility of AgCl.
A. 1.6 × 10^\( -5 \) M
B. 1.8 × 10^\( -5 \) M
C. 2.0 × 10^\( -5 \) M
D. 2.2 × 10^\( -5 \) M
Question 2
The polymerization of styrene to polystyrene is an example of a ______________ reaction.
A. chain reaction
B. step-growth reaction
C. condensation reaction
D. addition reaction
Question 3
A sample of air is collected in a container and analyzed for its composition. If the volume of the air sample is 1000 mL and the partial pressure of oxygen (O2) is 0.2 atm, what is the mass of the O2 in the air sample?
A. 0.1 g
B. 0.2 g
C. 0.3 g
D. 0.4 g
Question 4
A 2.50 g sample of a polymer is dissolved in 100.0 mL of solvent. What is the concentration of the polymer in g/L?
A. 25.0
B. 50.0
C. 75.0
D. 100.0
Question 5
A 0.5 M solution of NaOH is mixed with a 0.2 M solution of HCl. Calculate the pH of the resulting solution.
A. 1.3
B. 1.5
C. 1.7
D. 1.9
Question 6
The equilibrium cons\tant for a reaction is ______________.
A. K = [C]^2/[A]^2
B. K = [C]/[A]
C. K = [A]/[C]
D. K = [A]^2/[C]^2
Question 7
The atomic radius of an atom is the dis\tance from the nucleus to the outermost electron. If the atomic radius of an atom is 1.5 Å, what is the atomic radius in picometers?
A. 150 pm
B. 200 pm
C. 250 pm
D. 300 pm
Question 8
A 1.00 L sample of a gas is collected at 25.0°C and 1.00 atm. What is the volume of the gas at 50.0°C and 2.00 atm?
A. 1.07
B. 1.17
C. 1.27
D. 1.37
Question 9
A 2.0 L sample of a solution containing 0.1 M HCl and 0.1 M NaOH is titrated with 0.1 M HCl. Calculate the pH after 50 mL of HCl has been added.
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 10
A diagram of a titration setup is shown below. If 25.0 mL of 0.100 M $\text{HCl}$ is added to 25.0 mL of 0.100 M $\text{NaOH}$, what is the pH of the resulting solution?
A. 7.00
B. 8.00
C. 9.00
D. 10.0
Question 11
The molar mass of a subs\tance is the mass of one mole of the subs\tance. If the molar mass of a subs\tance is 50 g/mol, what is the mass of 2 moles of the subs\tance?
A. 100 g
B. 200 g
C. 300 g
D. 400 g
Question 12
The atomic radius of an element is 100 pm. What is the expected atomic radius of its isotope with a mass number of 20?
A. 120 pm
B. 100 pm
C. 80 pm
D. 60 pm
Question 13
A polymer has the following structure: [-CH2-CH2-O-]n. What is the type of polymerization reaction that occurred to form this polymer?
A. Condensation polymerization
B. Addition polymerization
C. Ring-opening polymerization
D. Step-growth polymerization
Question 14
A 1.0 L sample of a solution containing 0.1 M HCl and 0.1 M NaOH is titrated with 0.1 M HCl. Calculate the pH after 100 mL of HCl has been added.
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 15
The polymerization of styrene to polystyrene involves the addition of a monomer unit to the growing polymer chain. If the initial concentration of styrene is 2.5 M and the reaction is 50% complete, what is the concentration of the monomer unit added to the polymer chain?
A. 1.25 M
B. 2.5 M
C. 5 M
D. 10 M

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